High Level (Cirriform) Amount-When-Present (%) June, July, August (1954 - 1997) Night, Ship Observations Only Global Average: 36.2 Zonal Averages 15 zones Lat.N Average 85 37.0 75 37.9 65 32.5 55 33.6 45 34.5 35 33.5 25 31.2 15 37.8 5 39.1 -5 36.6 -15 32.3 -25 34.2 -35 39.0 -45 37.3 -55 41.4 Grid Box Averages 268 filled boxes Box # Lat.N Lon.E Average 1 85 60 28.6 2 85 180 46.3 3 85 300 33.2 4 75 20 32.0 5 75 60 31.8 6 75 100 32.5 7 75 140 48.8 8 75 180 44.2 9 75 220 39.9 10 75 260 34.6 11 75 300 31.6 12 75 340 32.5 13 65 10 29.8 14 65 30 31.0 15 65 50 31.6 20 65 150 28.4 21 65 170 34.1 22 65 190 33.6 23 65 210 25.0 25 65 250 36.8 26 65 270 32.5 27 65 290 33.5 28 65 310 32.1 29 65 330 30.4 30 65 350 35.0 31 55 10 32.3 32 55 30 33.4 37 55 130 27.3 38 55 150 30.4 39 55 170 34.4 40 55 190 33.9 41 55 210 31.9 42 55 230 29.6 44 55 270 31.2 45 55 290 33.2 46 55 310 34.9 47 55 330 40.3 48 55 350 31.6 49 45 5 31.4 50 45 15 31.1 51 45 25 35.1 52 45 35 32.4 62 45 135 34.2 63 45 145 35.9 64 45 155 30.3 65 45 165 33.6 66 45 175 36.0 67 45 185 43.9 68 45 195 33.0 69 45 205 34.3 70 45 215 34.3 71 45 225 34.4 72 45 235 29.9 77 45 285 38.4 78 45 295 36.1 79 45 305 35.0 80 45 315 37.6 81 45 325 33.5 82 45 335 33.8 83 45 345 30.5 84 45 355 29.8 85 35 5 32.4 86 35 15 32.6 87 35 25 31.4 88 35 35 31.1 97 35 125 39.0 98 35 135 41.2 99 35 145 35.0 100 35 155 32.4 101 35 165 39.8 102 35 175 30.8 103 35 185 31.6 104 35 195 30.9 105 35 205 29.4 106 35 215 32.1 107 35 225 35.1 108 35 235 30.9 109 35 245 32.0 112 35 275 36.6 113 35 285 38.1 114 35 295 34.8 115 35 305 32.2 116 35 315 30.9 117 35 325 28.0 118 35 335 28.8 119 35 345 30.8 120 35 355 30.3 124 25 35 34.6 126 25 55 49.0 127 25 65 51.9 131 25 105 40.6 132 25 115 36.8 133 25 125 34.5 134 25 135 32.1 135 25 145 29.5 136 25 155 32.0 137 25 165 29.6 138 25 175 28.6 139 25 185 27.8 140 25 195 29.8 141 25 205 31.5 142 25 215 35.0 143 25 225 33.8 144 25 235 32.9 145 25 245 28.4 146 25 255 30.0 147 25 265 27.0 148 25 275 27.4 149 25 285 31.5 150 25 295 30.2 151 25 305 28.4 152 25 315 26.4 153 25 325 25.3 154 25 335 41.1 155 25 345 42.9 160 15 35 39.9 161 15 45 47.8 162 15 55 47.7 163 15 65 48.1 164 15 75 50.0 165 15 85 44.7 166 15 95 51.1 167 15 105 54.5 168 15 115 38.7 169 15 125 35.8 170 15 135 34.9 171 15 145 32.3 172 15 155 35.3 173 15 165 38.0 174 15 175 32.6 175 15 185 33.5 176 15 195 34.7 177 15 205 28.5 178 15 215 32.6 179 15 225 32.8 180 15 235 34.5 181 15 245 32.5 182 15 255 34.4 183 15 265 37.1 184 15 275 35.3 185 15 285 37.7 186 15 295 35.2 187 15 305 36.7 188 15 315 32.4 189 15 325 34.8 190 15 335 49.0 191 15 345 49.6 193 5 5 39.8 197 5 45 41.6 198 5 55 41.5 199 5 65 44.6 200 5 75 48.8 201 5 85 45.2 202 5 95 47.6 203 5 105 42.9 204 5 115 43.1 205 5 125 41.4 206 5 135 42.3 207 5 145 34.1 208 5 155 32.5 209 5 165 38.5 210 5 175 33.4 211 5 185 34.6 212 5 195 37.4 213 5 205 33.1 214 5 215 29.9 218 5 255 40.6 219 5 265 33.9 220 5 275 40.2 221 5 285 42.0 223 5 305 32.3 224 5 315 33.6 225 5 325 29.4 226 5 335 36.9 227 5 345 41.1 228 5 355 37.2 229 -5 5 37.6 230 -5 15 43.0 233 -5 45 35.3 234 -5 55 36.3 235 -5 65 45.3 236 -5 75 41.5 237 -5 85 39.4 238 -5 95 35.4 239 -5 105 38.2 240 -5 115 32.8 241 -5 125 32.7 242 -5 135 37.2 243 -5 145 41.1 244 -5 155 42.1 245 -5 165 37.8 246 -5 175 32.3 247 -5 185 29.8 248 -5 195 32.5 254 -5 255 29.6 255 -5 265 28.7 256 -5 275 44.4 260 -5 315 33.6 261 -5 325 27.1 262 -5 335 25.0 264 -5 355 33.8 265 -15 5 35.1 266 -15 15 36.8 269 -15 45 24.3 270 -15 55 26.1 271 -15 65 31.5 272 -15 75 34.6 273 -15 85 28.6 274 -15 95 29.7 275 -15 105 29.6 276 -15 115 30.9 277 -15 125 29.3 278 -15 135 35.6 279 -15 145 34.8 280 -15 155 32.0 281 -15 165 31.9 282 -15 175 35.2 283 -15 185 34.0 284 -15 195 29.2 285 -15 205 25.9 286 -15 215 31.4 292 -15 275 44.6 297 -15 325 30.6 300 -15 355 35.1 301 -25 5 30.9 302 -25 15 36.0 304 -25 35 33.3 305 -25 45 25.6 306 -25 55 27.6 310 -25 95 25.9 311 -25 105 24.9 312 -25 115 31.1 316 -25 155 28.7 317 -25 165 31.1 318 -25 175 35.0 319 -25 185 36.9 320 -25 195 46.2 321 -25 205 36.3 322 -25 215 36.2 323 -25 225 33.9 324 -25 235 34.9 332 -25 315 36.3 333 -25 325 36.4 334 -25 335 37.0 336 -25 355 30.0 337 -35 5 32.6 338 -35 15 39.8 339 -35 25 36.0 340 -35 35 36.8 341 -35 45 31.9 342 -35 55 33.6 348 -35 115 35.5 349 -35 125 38.4 350 -35 135 44.9 351 -35 145 49.1 352 -35 155 38.1 353 -35 165 40.1 354 -35 175 41.8 355 -35 185 34.4 365 -35 285 40.7 367 -35 305 38.1 368 -35 315 50.6 369 -35 325 41.8 390 -45 175 35.7 402 -45 295 39.2 403 -45 305 37.1 423 -55 290 45.3 424 -55 310 35.9